Do not restart etcd quickly

https://github.com/coreos/etcd/pull/2878

etcd destroys itself if you start and then restart etcd very rapidly.
So don't do that any more.

contrib/ansible/roles/etcd/handlers/main.yml

@@ -1,6 +1,7 @@
 ---
 - name: restart etcd
   service: name=etcd state=restarted
+  when: etcd_started.changed == false
 
 - name: Save iptables rules
   command: service iptables save

contrib/ansible/roles/etcd/tasks/main.yml

@@ -14,7 +14,11 @@
         - restart etcd
 
 - name: Enable etcd
-  service: name=etcd enabled=yes state=started
+  service: name=etcd enabled=yes
+
+- name: Start etcd
+  service: name=etcd state=started
+  register: etcd_started
 
 - include: firewalld.yml
   when: has_firewalld